Finished drilling the #3 cam bearing to connect it with the #2 cam bearing oil gallery. The first Hoover Mod on my engine is done: After years of research (procrastination), two weeks of ordering parts, and two hours of cautious work (since I only had cordless drill and an engine propped up on 2x4s). In honor of Mr. R.S.Hoover, I can now officially designate this engine as DHVX-001: Dunning-Hoover-Volkswagen-Experimental, Serial Number One. After drilling the 1/8" pilot hole yesterday, I started by checking the depth of the cavity in the case at the end of the drilling. This is the cavity you can drill through if there isn't enough material in the case, basically scrapping the engine case. This appeared to check fine. Next, I put the drill in the oil gallery and sighted down my micrometer to draw a "do not exceed" silver sharpie mark on my drill bit. Set my cordless drill to 1,800 RPM and began drilling, making lots of stops to vacuum out the chips. There was definitely a surge as the bit finally breached the 1/8" pilot hole. I opted to updrill my #3 cam bearing pilot hole from 1/8" to 3/16" since that was the next size up in my drill guide. This time, I placed the aircraft drill into the oil galley and used the micrometer as a depth gauge to determine how deep I had to drill to reach the extended oil gallery. Then added a "do not exceed" blue sharpie mark to my 3/16" and 7/32" drill bits. One thing to note, I put the aircraft drill into the oil gallery and pushed it all the way in. This was to prevent me from drilling down too deeply into the case. This will definitely ruin your drill bits if you push too hard at the bottom...but drill bits are much cheaper than engine cases! The updrilling went quickly with four stops to vacuum out chips. I took very light pecks once I contacted the aircraft drill serving as a depth stop. I then removed the aircraft drill turned drill stop and carefully drilled to the bottom of the extended oil gallery by hand. Then repeated the whole procedure with a 7/32" drill. I had to do this freehand since there was no matching size in my drill block but it went okay. Checking with a bright light I was happy to see both holes lined up perfectly despite my rudimentary tools. This procedure definitely made lots of chips so I can understand why Bob was adamant about pulling all the oil gallery plugs to facilitate cleaning the case! https://bobhooversblog.blogspot.com/2007/06/hvx-mods-again.html https://bobhooversblog.blogspot.com/2007/05/hvx-mods.html